When Does the Car Electric Fan Turn On?
2 Answers
Car electric fans start rotating when the coolant temperature rises to the upper limit and the thermostat activates the power supply. Here is relevant information about car electric fans: Function: The role of the car electric fan is to cool the engine radiator. When the engine temperature rises to a set limit, the electric fan begins to operate. Once the coolant temperature drops to the lower limit, the thermostat cuts off the power supply, and the fan stops working. Reasons for Electric Fan Failure: Poor motor lubrication, motor overheating, reduced starting capacitor capacity, prolonged motor usage, and other factors can cause the electric fan to stop rotating. In such cases, it is advisable to promptly visit a 4S shop for inspection and repair.
Every time I go on a long-distance drive, I pay special attention to the water temperature gauge on the dashboard. The car's electric fan primarily activates based on engine temperature. In normal city driving with frequent stops and starts, when stuck in traffic, the radiator temperature exceeds 90 degrees, and the electric fan starts humming to cool it down. When using the air conditioning in summer, the compressor increases pressure on the cooling system, causing the fan to start earlier even if the water temperature hasn’t exceeded the limit. However, new cars and older cars behave differently. For example, the German cars I’ve driven tend to activate the fan more proactively, while Japanese cars wait a few more degrees before it kicks in. Additionally, after turning off the engine, the fan might occasionally run for a few minutes to dissipate residual heat—this is completely normal, so there’s no need to panic when you hear it.
